I like those flashbacks...They have Hanji-antics and lampshading that biting your hand hard enough to draw blood freaking hurts. And my tentative guess is ending with the capture, even though I really want to get this arc over with.

Consider: Assuming all or most of the Titans come from Humans, the vast majority of the population has already been converted. Barring aliens or something, this majority was converted either intentionally by humans, accidentally through the environment (Spilling Murder-in-a-jar or whatever into the water plant, I don't know) or through the Titans themselves. It seems to have gotten out of control, so it's probably safe to rule out the first choice. I can't dismiss the second, but as for the third...

The Titans eat humans, and then spit them out. There appears to be no reason for this. The military orders for all of the cadavers to be burned to ash after they've been regurgitated.

What if this is where the non-sentient Titans come from? It would explain how it got so out of control.

Fire, air, water, earth...legend has it that when these four elements are gathered, they will form the fifth element...boron.

They don't have to reproduce as they're practically immortal. Most the titans we've seen are probably over a hundred years old, dated back to the time when they first showed up.

As for why they throw up, they only throw up when their tummies are full.

As for how Titans are made, we know at least they can be done via serum and something else more magical-instantaneous like with what happened with Connie's village. Maybe via nanomachines or a virus (or a magical command).

My theory is that they were created as a war weapon or something along those lines, and designed to both kill people and reproduce. (They have no reason to eat humans—they can kill them just fine through other means.) The only time we've seen the serum being used was on Eren, and he's abnormal as far as Titans go. Given that civilization seems to be destroyed, I also find it unlikely that all of the Titans were created intentionally, even if the first ones were.

Fire, air, water, earth...legend has it that when these four elements are gathered, they will form the fifth element...boron.

I think I had mentioned something like that theory earlier. Only I think the regular Titans we see were failed attempts at that. Note we've only seen some Titan Shifters swallowing humans and release them unharmed. And we know humans have to be alive in order to become Titans.

Also, I mentioned this earlier, but no one seemed to notice, that I think, like a theory in Borderlands about how there were so many pscyhopaths, is that either Titans are being cloned somehow or there are captive women forced to become baby-making machines to make more Titans.

Here's a theory; what separates shifters from regular titans is whether or not the brain survives. We know that the shifters all get a healing factor, and that transformation is triggered by injury, but in the case of a catastrophic injury to the brain, even if it heals there's no guarantee that the mind that had once inhabited that brain would survive. Eren was swallowed mostly whole, so his brain was in one piece, and the other shifters barring Ymir were probably titaniz— titanifie— made titans under more controlled circumstances, so risk of injury is minimal.

Ymir is what makes this idea interesting to me. She was a wild titan for something like sixty years, but she came out of it. I think maybe when she took the injury that made her transform the first time, it wasn't enough to leave her brain-dead, but instead put her into something like a persistent vegetative state or a coma. Her brain worked, so the titan-body didn't reject it as a foreign element, but it was too damaged to give input, and so, kept from aging by the titan's healing factor, it healed slowly over the course of sixty years. I also think this might be why her titan form had such a large head; the host's head was damaged, so whatever instinct controls the healing factor tried to compensate.

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